The Seiko 5S21-6040 is a watch model based on the 5S21 movement.
Parts List
| 260A05S10A | crystal - crystal |
| 30ME5NA4 | crown - crown |
| 0F220BAA3 | case back gasket - case back gasket |
| GK17C | band - leather band |
| 11T91VJM | hand - minute hand |
| 5S216040 | others - case back |
| 5S2160405WA | others - case |
| 5S216040XS14 | others - dial |
| 5S219 | others - machine code |
| A180BS | others - push pin |
| 0D005BA13 | others - crown and stem gasket |
| 0351683 | others - winding stem |
| 82840870 | others - case ring |
| 82361175 | others - bezel |
| 11SC793G | others - second hand |
| 11T91VJH | others - hour hand |
Caliber 5S21
